diff --git a/common/protob/messages-tezos.proto b/common/protob/messages-tezos.proto
index e429ce8b86..1bc37b8a00 100644
--- a/common/protob/messages-tezos.proto
+++ b/common/protob/messages-tezos.proto
@@ -55,6 +55,8 @@ message TezosSignTx {
     optional TezosTransactionOp transaction = 4;    // Tezos transaction operation
     optional TezosOriginationOp origination = 5;    // Tezos origination operation
     optional TezosDelegationOp delegation = 6;      // Tezos delegation operation
+    optional TezosProposalOp proposal = 7;          // Tezos proposal operation
+    optional TezosBallotOp ballot = 8;              // Tezos ballot operation
     /*
      * Tezos contract ID
      */
@@ -120,6 +122,24 @@ message TezosSignTx {
         optional uint64 storage_limit = 5;
         optional bytes delegate = 6;
     }
+    /**
+     * Structure representing information for proposal
+     */
+    message TezosProposalOp {
+        optional bytes source = 1;
+        optional uint64 period = 2;
+        optional uint64 bytes_in_next_field = 3;
+        optional bytes proposals = 4;
+    }
+    /**
+     * Structure representing information for ballot
+     */
+    message TezosBallotOp {
+        optional bytes source = 1;
+        optional uint64 period = 2;
+        optional bytes proposal = 3;
+        optional bytes ballot = 4;
+    }
 }
 
 /**
diff --git a/core/src/apps/tezos/writers.py b/core/src/apps/tezos/writers.py
deleted file mode 100644
index 0c10054c82..0000000000
--- a/core/src/apps/tezos/writers.py
+++ /dev/null
@@ -1,24 +0,0 @@
-from apps.common.writers import (
-    write_bytes,
-    write_uint8,
-    write_uint32_be,
-    write_uint64_be,
-)
-
-write_uint8 = write_uint8
-write_uint32 = write_uint32_be
-write_uint64 = write_uint64_be
-write_bytes = write_bytes
-
-
-def write_bool(w: bytearray, boolean: bool):
-    if boolean:
-        write_uint8(w, 255)
-    else:
-        write_uint8(w, 0)
-
-
-# write uint16 in be
-def write_uint16(w: bytearray, n: int):
-    w.append((n >> 8) & 0xFF)
-    w.append(n & 0xFF)